Stand assembly for monitor

ABSTRACT

A stand assembly for a monitor is provided. The stand assembly includes a base and a stand having an upper end rotatably coupled to a monitor body, and a lower end rotatably coupled to the base. The stand assembly also includes torque correcting means for generating a torque which varies non-linearly with rotation of the stand, thus allowing a tilt angle of a monitor body coupled to the stand assembly to be easily adjusted throughout a large range of motion.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application is a Continuation Application of application Ser. No.11/005,027 filed Dec. 7, 2004, now U.S. Pat. No. 7,198,237 which claimspriority to Application Ser. Nos. P2004-31766 filed in Korea on May 6,2004 and P2004-36340 filed in Korea on May 21, 2004, the entirety ofwhich is incorporated herein by reference.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention relates to a stand assembly for supporting amonitor on a floor, and more particularly, to a stand assembly for aflat monitor for rotatably supporting the flat monitor.

2. Discussion of the Related Art

In general, in order to use flat monitors, such as LCD monitors, atdesks or tables, stands for supporting the monitors are required. Thestand is coupled to a backside of the monitor with a hinge assembly sothat a user can adjust a tilting angle of the monitor to desireddegrees.

A structure of related art monitor apparatus will be described briefly,with reference to FIG. 1.

There is a stand 3 at an upper end and a lower end thereof rotatablycoupled to a monitor body 1 and a base 2 on a floor, with a monitorhinge 5 and a base hinge 6 respectively, thereby connecting the monitorbody 1 and the base 2.

At opposite sides of the stand 3, there are one pair of parallel linkmembers 7 for converting rotation of the stand 3 with respect to thebase 2 to rotation of the monitor body 1. The link members 7 serve torotate the monitor body 1 to a predetermined angle interlocked withrotation of the stand 3 with respect to a plane of the base 2. Ofcourse, rotation of only the monitor body with respect to the stand isalso possible.

The base hinge 6 is provided with a first base hinge 6 a, and a secondbase hinge 6 b, and the first base hinge 6 a is provided with a torsionspring 6 c for exerting an elastic force in a direction opposite to adownward rotation direction of the stand 3 toward the plane of base 2,to offset a torque generated by gravity of the monitor body 1.

Each of the first base hinge 6 a and the monitor hinge 5 has a hingeshaft (not shown) inserted in an inserting hole therein, and engagedwith an inside circumferential surface of the inserting hole with apredetermined friction, to support the torque generated by the gravityof the monitor body 1, too.

However, the related art monitor apparatus has the following problems.

When the user applies pressure to the monitor body in an upper or lowerdirection, the stand 3 rotates about the base hinge 6, to adjust atilting angle of the stand 3 with respect to the base 1. In thisinstance, a tilting angle of the monitor body is adjusted by the linkmembers, automatically. That is, at the time of tilting angle adjustmentof the stand 3 with respect to the base 2, the tilting angle of themonitor body 1 with respect to the stand 3 is also adjustedautomatically, and the present state is maintained.

Of course, if the monitor body 1 at a top or a bottom thereof is pushedbackward, or pulled forward, the monitor body 1 rotates about themonitor hinge 5, to adjust the tilting angle of the monitor body 1 withrespect to the stand 3 only.

However, since the related art monitor apparatus has the torque causedby the gravity of the monitor body 1 supported by the torsion spring 6 cand friction of the hinge shaft (not shown), if the tilting angle θ ofthe stand 3 with respect to the base 2 is outside of a predeterminedrange of angle, since application of a working force is required, whichis greater than a torque required for adjustment of the tilting angle ofthe monitor body, smooth adjustment of the tilting angle can not beachieved.

In more detail, referring to FIG. 2, the torque Tn required forsupporting the monitor body 1 varies with the tilting angle θ followinga locus of a curved line. However, the torque Ts available from thetorsion spring 6 c varies with the tilting angle θ following a locus ofa straight line, and a total torque Ta available from the torsion spring6 c and friction of the hinge shaft (not shown) also varies following alocus of a straight line. This is because the torque Ts of the torsionspring is proportional to a spring constant and a torsion angle, and thefriction is constant regardless of the tilting angle.

Therefore, in a case the tilting angle is smaller or greater than acertain range, the working force required varies with the tilting anglesignificantly due to a great difference between the required torque Tnand an actual available torque Ta, failing to achieve the smoothoperation.

SUMMARY OF THE INVENTION

Accordingly, the present invention is directed to a stand assembly for amonitor that substantially obviates one or more problems due tolimitations and disadvantages of the related art.

An object of the present invention is to provide a stand assembly for amonitor, which enables smooth rotation of the monitor.

Additional advantages, objects, and features of the invention will beset forth in part in the description which follows and in part willbecome apparent to those having ordinary skill in the art uponexamination of the following or may be learned from practice of theinvention. The objectives and other advantages of the invention may berealized and attained by the structure particularly pointed out in thewritten description and claims hereof as well as the appended drawings.

To achieve these objects and other advantages and in accordance with thepurpose of the invention, as embodied and broadly described herein, astand assembly for a monitor includes a base, a monitor body, a standhaving an upper end rotatably coupled to the monitor body, and a lowerend rotatably coupled to the base, for supporting the monitor body, andtorque correcting means for generating a torque non-linearly varied withrotation of the stand.

Preferably, the coupling of the stand to the base further includes atleast one of friction torque generating means for generating a frictiontorque, and torsional torque generating means for generating a torsionaltorque.

Preferably, the coupling of the monitor body to the stand furtherincludes at least one of friction torque generating means for generatinga friction torque, and torsional torque generating means for generatinga torsional torque.

The friction torque generating means may be at least one combination ofdisc springs arranged substantially vertical to a rotation direction anda curling spring arranged in a direction the same with the rotationdirection.

Preferably, the torsional torque generating means is a torsion spring.

The torque correcting means may be an elastic member having one endrotatably secured at a position away from a rotation axis of the standwith respect to the base, and the other end rotatably, and positionvariably coupled at a position away from a rotation axis of the monitorbody with respect to the stand, for varying a length thereof withrotation of the stand, to vary a elastic force.

In more detail, preferably, the torque correcting means includes arotating member rotatably coupled to the upper end of the stand, a firstlink bar, and a second link bar, each having one end connected to aposition away from the rotation axis of the stand with respect to thebase, and the other end connected to the rotating member at a positionaway from the rotation axis of the monitor body with respect to thestand, and an elastic member having one end secured to the first linkbar, and the other end secured to the second link bar, for generating anelastic force as the stand rotates.

Preferably, the elastic member is mounted such that the elastic memberapplies elastic force to the first, and second link bars in a diagonaldirection.

In another aspect of the present invention, a stand assembly for amonitor includes a base on a floor, a stand having an upper endrotatably coupled to a monitor body, and a lower end rotatably coupledto the base, for supporting the monitor body, a monitor hinge having ahinge shaft for rotatably coupling the upper end of the stand to themonitor body, a base hinge for rotatably coupling the lower end of thestand to the base, a rotating member rotatably mounted on the upper endof the stand, a first link bar, and a second link bar parallel to eachother, each having one end connected to the rotating member, and theother end connected to the base hinge, and an elastic member having oneend secured to the first link bar, and the other end secured to thesecond link bar, for applying an elastic force to the first, and secondlink bars according to titling angle variation of the stand.

Thus, the present invention permits to obtain a smooth working force,enabling the user to make easy adjustment of a tilting angle throughoutentire moving range by uniform force because the working force actsnon-linearly in correspondence to required torque, by torque of thetorsion springs and/or disc springs inside of the base hinge, and torqueof the elastic member.

It is to be understood that both the foregoing general description andthe following detailed description of the present invention areexemplary and explanatory and are intended to provide furtherexplanation of the invention as claimed.

BRIEF DESCRIPTION OF THE DRAWINGS

The accompanying drawings, which are included to provide a furtherunderstanding of the invention and are incorporated in and constitute apart of this application, illustrate embodiment(s) of the invention andtogether with the description serve to explain the principle of theinvention. In the drawings;

FIG. 1 illustrates a perspective view of a related art flat monitorapparatus;

FIG. 2 illustrates a graph of a required torque vs. an actual availabletorque of a related art stand assembly;

FIG. 3 illustrates a perspective view of a stand assembly for a monitorin accordance with a preferred embodiment of the present invention;

FIG. 4 illustrates an enlarged perspective view of a monitor hinge of astand assembly for a monitor in FIG. 3;

FIG. 5 illustrates a disassembled perspective view of the stand assemblyin FIG. 3;

FIG. 6 illustrates a section of key parts of the monitor hinge of thestand assembly in FIG. 4;

FIGS. 7 and 8 each illustrates a side view showing a stand tilting angleadjustment operation of the stand assembly in FIG. 3, schematically;

FIG. 9 illustrates a diagram for explaining action of first, and secondlink members, and rotating member following tilting angle adjustmentoperation of a stand, schematically;

FIG. 10 illustrates a graph showing a required torque vs. an actualavailable torque of a stand assembly in accordance with a preferredembodiment of the present invention;

FIG. 11 illustrates a side view showing a rotation angle adjustmentoperation of the monitor body by the stand assembly in FIG. 3,schematically;

FIG. 12 illustrates a side view of a folded state of the stand assemblyin FIG. 3, schematically;

FIG. 13 illustrates a section of key parts of a stand assembly for amonitor in accordance with another preferred embodiment of the presentinvention;

FIG. 14 illustrates a perspective view of a stand assembly for a monitorin accordance with another preferred embodiment of the presentinvention;

FIG. 15 illustrates a disassembled perspective view of the monitor hingeof the stand assembly for a monitor in FIG. 14.

DETAILED DESCRIPTION OF THE INVENTION

Reference will now be made in detail to the preferred embodiments of thepresent invention, examples of which are illustrated in the accompanyingdrawings. Wherever possible, the same reference numbers will be usedthroughout the drawings to refer to the same or like parts.

A structure and operation of the stand assembly for a monitor inaccordance with a preferred embodiment of the present invention will bedescribed with reference to FIGS. 3˜9.

Referring to FIG. 3, there is a pivot bracket 30 fixedly secured to abackside of a monitor body 1, for pivoting the monitor body 1 on an axisperpendicular to a plane of a monitor screen. There is an upper end ofthe stand 40 rotatably coupled to a lower end of the pivot bracket 30with a monitor hinge 50. A lower end of the stand 40 is rotatablycoupled to the base 20 with a base hinge 60. Of course, the monitor body1 may be coupled to the stand without the pivot bracket 30.

At one side of the stand 40, there are a first link bar 71 and a secondlink bar 72 (see FIG. 5) arranged parallel to each other as angleadjusting means for keeping an angle of a monitor body 1 constantinterlocked with rotation of the stand 40 with respect to the base 20.The first, and second link bars 71, and 72 have upper ends rotatablysecured to a rotating member 55 mounted on the monitor hinge 50, andlower ends rotatably secured to a second base bracket 65 of the basehinge 60.

It is preferable that the first, and second link bars 71, and 72 havethe same lengths.

Referring to FIGS. 4 and 5, the monitor hinge 50 includes an upper hingeshaft 51 inserted both in an insertion hole 31 in the lower end of thepivot bracket 30, and an insertion hole 41 in one side of the upper endof the stand 40.

The upper hinge shaft 51 has a cylindrical middle portion 512 forinserting both in the insertion hole 31 in the pivot bracket 30 and theinsertion hole 41 in the stand 40, and opposite side portions 514, and516 each cut flat starting from the middle portion 512. One flat endportion 514 of the upper hinge shaft 51 is inserted, and secured to ahole (not shown) formed in a shape complementary to the rotating member55. According to this, the rotating member 55 rotates together with theupper hinge shaft 51.

Referring to FIGS. 5 and 6, it is preferable that the other one flat endportion 516 of the upper hinge shaft 51 has friction torque generatingmeans, for an example, a plurality of disc springs 52 of conical ringshapes inserted therein overlapped with one another. The disc springs 52generate torque by friction between the upper hinge shaft 51 and thepivot bracket 30 as the disc springs 52 are brought into close contactwith a surface of the pivot bracket 30. Therefore, application of aworking force greater than the friction is required for rotating themonitor body 1. At an outer side of the disc springs 52, there is a nut54 threaded to an end of the upper hinge shaft 51 for bringing the discsprings 52 into close contact with the surface of the pivot bracket 30.

It is preferable that the monitor hinge 50 also has rotating anglelimiting means for limiting a rotation angle of the monitor body 1 withrespect to the stand 40. In the embodiment, the rotating angle limitingmeans includes a stopper 57 of a washer shape having a stopper tip 57 aformed on an outside circumference as one unit therewith, for engagementwith the flat portion of the upper hinge shaft 51, and a step 32 at thepivot bracket 30 in a rotation locus of the stopper 57 for bringing intocontact with, and holding the stopper 57.

It is preferable that there are flat washers 58 between the rotatingmember 55 and the stand 40, between the stand 40 and the pivot bracket30, between the pivot bracket 30 and the stopper 57, and between thedisc springs 52 and the nut 54, respectively.

It is preferable that, at an outer side of the disc springs 52, there istorsional torque generating means, for an example, an upper torsionspring 53 mounted to surround outside circumferential surfaces of thedisc springs 52. The upper torsion spring 53 has one end secured to thepivot bracket 30, and the other end secured to the stand 40 forproducing an elastic force as the torsion spring 53 is twisted.

Though the other end of the torsion spring 53 is designed to be securedto the stand 40 in the embodiment, different from this, by securing aseparate holding plate to the upper hinge shaft 51, and fastening theother end of the torsion spring 53 to the holding plate, the other endof the torsion spring can be secured to the upper hinge shaft.

In the meantime, referring to FIGS. 3 and 5, the base hinge 60 includesa first base bracket 61 fixedly secured to the base 20, a first lowerhinge shaft 62 formed as one unit with the first base bracket 61 to passone side of the lower end of the stand 40, a second base bracket 65fixedly secured to the base 20 at a location spaced a distance away fromthe first base bracket 65, and a second lower hinge shaft 64 passedthrough, and engaged with the second base bracket 65 and the other sideof the lower end of the stand 40. Of course, different from this, onlyone base bracket and hinge shaft can also be used.

The torque correcting means is an elastic member having one endrotatably secured at a position away from a rotation axis of the standwith respect to the base, and the other end rotatably, and positionvariably coupled at a position away from a rotation axis of the monitorbody with respect to the stand, for varying a length thereof withrotation of the stand, to vary a elastic force.

Mounted on the first lower hinge shaft 62 of the first base bracket 61,there is a lower torsion spring 63 for supporting the stand 40 againstthe first base bracket 61, elastically. The lower torsion spring 63serves to exert torque in a direction opposite to loads of the monitorbody 1 and the stand 40, to prevent the stand 40 from foldingautomatically by the load of the monitor body 1, to maintain a state thetilting angle of the monitor body 1 is adjusted. It is preferable thatthe elastic force of the lower torsion spring 63 is slightly lower thanthe torque generated by the loads of the monitor body 1 and the stand40.

The second lower hinge shaft 64 has a cut flat end portion 642, in whichthe friction torque generating means, i.e., the plurality of discsprings 66 of conical ring shape are inserted overlapped with oneanother. It is preferable that the disc springs 66 are brought intoclose contact with the lower end of the stand 40 until predeterminedfriction is formed, caulked, and fixedly secured.

In the meantime, referring to FIG. 5, upper ends of the first link bar71 and the second link bar 72 are inserted in spaced slots 55 a in therotating member 55 formed along a circumferential direction thereof, androtatably fastened to the rotating member 55 with a connection pin 56.

Lower ends of the first link bar 71 and the second link bar 72 areinserted in slots 65 a in the second base bracket 65 formed along acircumferential direction thereof, and rotatably fastened to the secondbase bracket 65 with connection pins 67.

It is preferable that the first link bar 71 and the second link bar 72,each having an ‘L’ section, are mounted opposite to each other in astate the first link bar 71 and the second link bar 72 can move indifferent planes, such that the first link bar 71 and the second linkbar 72 form a substantially rectangular section when the first link bar71 and the second link bar 72 are fastened to the rotating member 55 andthe second base bracket 65.

The first, and second link bars 71, and 72 have torque correcting means,for an example, holding pieces 71 a, and 72 a on upper and lower sidesthereof respectively each formed as one unit therewith at a right anglethereto, and ends of tension springs 75 are secured to the holdingpieces 71 a, and 72 a, respectively.

Referring to FIG. 9, it is preferable that the connection pins 56, and67 of the first, and second link bars 71, and 72 have a phase differenceof 180° from each other. Since the link bars 71, and 72 have the samelengths and parallel to each other, a line segment L1 between theconnection pins 67 of the second base bracket 65, and a line segment L2between the connection pins 56 of the rotating member 55 are parallel toeach other.

In the meantime, in the stand assembly of this embodiment, the oppositeends of the first, and second link members 71, and 72 are connected todifferent planes perpendicular both to the planes of the monitor and thebase of the rotating member 55 and the second base bracket 65. However,the opposite ends of the first, and second link members 71, and 72 areconnected to the same plane perpendicular both to the planes of themonitor and the base of the rotating member 55 and the second basebracket 65.

The operation of the foregoing stand assembly will be described.

The tilting angle adjustment of the stand 40 with respect to the base 20will be described.

When the monitor body 1 and the stand 40 are in a state as shown in FIG.7, if the user holds, and applies force to, the monitor body 1, to movethe stand 40 in a direction of an arrow, the stand 40 rotates about thefirst lower hinge shaft 62 (see FIG. 5), and the second lower hingeshaft 64 (see FIG. 5) until the stand 40 is in a state as shown in FIG.8.

In this instance, the lower torsion spring 63 (see FIG. 3) and the discspring 66 (see FIG. 3) generate torques in a direction opposite torotation of the stand 40, and maintain the stand 40 in an adjusted stateat a predetermined angle.

In the meantime, if the stand 40 moves in the arrow direction, an anglebetween the monitor body 1 and the base 20 can be maintained as it is asthe rotating member 55 and the upper hinge shaft 51 rotate about thestand 40 because lower ends of the first, and second link bars 71, and72 are fixed to the second base bracket 65.

In other words, if the stand 40 is rotated about the first, and secondhinge shafts 62, and 64 of the base hinge 60, as shown in FIG. 9, sincethe first, and second link members 71, and 72 have the same lengths, andare parallel to each other, the ling segment L2 between the connectionpins 56 of the rotating member 55 and the line segment L1 between theconnection pins 67 of the second base bracket 65 are always parallel toeach other. This implies that the line segment L2 between the connectionpins 56 of the rotating member 55 always has a fixed angle to theground. According to this, if the stand 40 is rotated, the rotatingmember 55 coupled to the first, and second link bars 71 and 72 isrotated, and the monitor body 1 coupled to the rotating member 55 withthe upper hinge shaft 51 is rotated with respect to the stand 40, tomaintain a fixed angle with respect to the ground.

In the meantime, since the first, and second link members 71, and 72have different centers of rotation, when the first, and second linkmembers 71, and 72 rotate at the same time, a distance between theholding pieces 71 a, and 72 a varies with a rotation angle. In moredetail, when the first, and second link members 71, and 72 rotate withthe stand 40, since the first link member 71 rotates about the upperconnection pin 67 a away from an axis ‘o’ of the first and second hingeshafts 62, and 64 in an upper direction, the holding piece 71 a movesdown by a predetermined distance ε1. Opposite to this, since the secondlink member 72 rotates about the lower connection pin 67 b away from anaxis ‘o’ of the first and second hinge shafts 62, and 64 in a lowerdirection, the holding piece 72 a moves up by a predetermined distanceε2.

Therefore, the smaller the angle between the base 20 and the stand 40,the greater a distance between the holding pieces 71 a, and 72 a, andthe tension spring 75 extends as much, to exert the elastic force asmuch.

In this instance, since a line segment 752 connecting opposite ends ofthe tension spring 75 is in a diagonal direction of the first, andsecond link members 71, and 72, the elastic force also acts in thediagonal direction. Of the components of the elastic force acting in thediagonal direction thus, there is a component acting in a direction ofthe torque of the stand 40, which is added to the torques of the elasticforce of the torsion spring 63 (see FIG. 3) and the friction of the discsprings 66 (see FIG. 3), to develop a non-linear locus of a total torqueTa as shown in FIG. 10.

By making an appropriate adjustment of a spring constant of the tensionspring 75, a distance between the first, and second hinge shafts 62, and64 and the connection pins 67, and positions of the holding pieces 71 a,and 72 a, a torque from the elastic force of the tension spring 75 canbe adjusted to follow a locus identical to a locus of a required torqueTn.

Thus, when the tilting angle of the stand 40 is varied, the presentinvention can generate an ideal overall torque by a sum of the torque ofthe torsion spring 63, the torque from friction of the disc springs 66,and the torque from the elastic force of the tension spring 75 varied asthe tension spring 75 contracts or extends, to require application of asmooth working force.

Moreover, though the plurality of tension springs 66 are used forgenerating the torque of friction at the base hinge, different fromthis, a curling spring (not shown) having one opened end can be insertedin the insertion hole in the lower end of the stand 40 having the secondhinge shaft 64 passed therethrough, for generating torque by frictionbetween an inside circumferential surface of the curling spring and anoutside circumferential surface of the second lower hinge shaft.

Next, adjustment of a rotation angle of the monitor body 1 with respectto the stand 40 will be described, with reference to FIG. 11.

Referring to FIG. 11, when the monitor body 1 is pushed/pulled inforward/backward, the pivot bracket 30 fixedly secured to the monitorbody 1 rotates about the upper hinge shaft 51.

In this instance, referring to FIGS. 5 and 6, because an insidecircumferential surface of the inserting hole 31 of the pivot bracket 30is in contact with an outside circumferential surface of the upper hingeshaft 51 at a predetermined friction, the disc springs 52 are in contactwith an outside surface of the pivot bracket 30 at a predeterminedfriction, and the torsion spring 53 supports the pivot bracket 30against stand 40 elastically, making a torque to act in a directionopposite to a direction of movement of the pivot bracket 30 caused bythe friction and the elastic force, the monitor body 1 can maintain atilting angle adjusted state with respect to the stand 40 even if anexternal force is removed.

If the monitor body 1 is kept tilting forward with respect to the stand40, that is, if the monitor body 1 is tilted more than a predeterminedangle with respect to the stand 40, a front end of the step 32 of thepivot bracket 30 meets with the stopper tip 57 a on the stopper 57, tolimit anymore rotation of the monitor body 1.

By making appropriate design of a rotation range of the stand 40 withrespect to the base 20, and a rotation range of the stand 40 withrespect to the monitor body 1, the monitor having the stand assembly ofthe present invention applied thereto can be provided with a foldingfunction in which the monitor body 1 is folded on the base 20 completelyas shown in FIG. 12.

In the meantime, in the foregoing embodiment of the stand assembly, bymounting the tension spring 75 between the first, and second link bars71, and 72, the torque generated at the time of tilting angle adjustmentis made to be non-linear. However, different from above, in a case thepositions of the holding pieces 71 a, and 72 a of the first, and secondlink bars 71, and 72 are opposite to the present positions, i.e., aholding piece is formed at an upper side of the first link bar 71, and aholding piece is formed at a lower side of the second link bar 72, it isrequired to provide a compression spring.

Next, a stand assembly in accordance with another preferred embodimentof the present invention will be described with reference to FIG. 13.

The stand assembly of this embodiment has a configuration basicallyidentical to the stand assembly of the foregoing embodiment, except thatthe stand assembly of this embodiment is different from the standassembly of the foregoing embodiment in a configuration of a monitorhinge 150.

The monitor hinge 150 of this embodiment has an upper hinge shaft 151with a cylindrical middle portion 151 a, and opposite cut flat sides 151b, 151 c. The cylindrical portion 151 a of the upper hinge shaft 151 isin close contact both with an insertion hole 41 in the stand 40 and aninsertion hole 31 in a pivot bracket 30. Of the opposite cut flat sideportions, one side portion 151 b is forcibly inserted in, and secured toa rotating member 155. The upper hinge shaft 151 in the rotating member155 has a knurled portion 151 d at one side flat portion 151 b. Theknurled portion 151 d digs into an inside surface of the rotating member155 when the upper hinge shaft 151 is forcibly inserted into therotating member 155, so that there is no play between the upper hingeshaft 151 and the rotating member 155.

In the meantime, the other side flat portion 151 c of the upper hingeshaft 151 has a flat washer 154, a plurality of disc springs 156, and astopper 157 mounted thereon in succession. There is a nut 158 at anouter side of the stopper 157 threaded on the hinge shaft 151, andbetween the nut 158 and the stopper 157, there is a bushing 159 forbringing the disc springs 156 and the flat washers into close contactwith the pivot bracket 30.

Moreover, on the upper hinge shaft 151, there is a torsion spring 153mounted to surround outside circumferential surfaces of the bushing 159and the nut 158. The torsion spring 153 has one end secured to the pivotbracket 30, and the other end secured to a holding plate 153 a mountedto an outer side of the nut 158, to support the pivot bracket 30 againstthe hinge shaft 151, elastically.

Accordingly, when the pivot bracket 30 is rotated about the upper hingeshaft 151, a torque acts in a direction opposite to a direction ofrotation of the pivot bracket 30 caused by the friction of the discsprings 156, and the elastic force of the torsion spring 153, so thatthe monitor body 1 (see FIG. 7) maintains an angle tilted state withrespect to the stand 40.

A stand assembly in accordance with another preferred embodiment of thepresent invention will be described with reference to FIGS. 14 and 15.

The stand assembly of this embodiment also has a configuration basicallyidentical to the stand assembly of the foregoing embodiment, except thatthe stand assembly of this embodiment is different from the standassembly of the foregoing embodiment in a configuration of a monitorhinge 250.

The monitor hinge 250 of this embodiment has an upper hinge shaft 251passed through and secured both to an insertion hole 31 in a lower endof a pivot bracket 30, and an insertion hole 41 in one side of an upperend of the stand 40. On an inside circumference of the insertion hole 31in the pivot bracket 30, there is a curling spring 253 in close contactwith an outside circumferential surface of the upper hinge shaft 251 forgenerating a predetermined friction. Moreover, there is a stopper 257 atone end portion of the upper hinge shaft 251, for adjusting a rotationangle of the monitor body 1 (see FIG. 10) with respect to the upperhinge shaft 251.

The curling spring 253 has a ring shape with one opened side, andinserted in the insertion hole 31 in the pivot bracket 30.

Alike the foregoing embodiment, the stopper 257 has a stopper tip 257 aon an outside circumference. The stopper 257 limits a rotation angle ofthe monitor body 1 as the stopper 257 is brought into contact with thestep 32 (see FIG. 4) in a lower end of the pivot bracket 30 having thehinge shaft passed therethrough.

The foregoing stand assembly is operated as follows.

As described before, the stand assembly of this embodiment is differentfrom the foregoing embodiment only in the configuration of the monitorhinge shaft 150. Therefore, the tilting angle adjustment of the stand 40with respect to the base 20 (see FIG. 7) is identical to the foregoingembodiment, description of which will be omitted.

When the monitor body 1 (see FIG. 10) is rotated in up/down directionwith respect to the stand 40, the pivot bracket 30 rotates about theupper hinge shaft 251. In this instance, since the upper hinge shaft 251is in close contact with an inside circumferential surface of thecurling spring 253 inside of the pivot bracket 30, there is frictionbetween the pivot bracket 30, the curling spring 253, and the upperhinge shaft 251. Since this friction generates a torque in a directionopposite to the movement of the pivot bracket 30, even if an externalforce is removed, the monitor body 1 can maintain an angle adjustedstate with respect to the stand 40.

The stand assembly for a monitor of the present invention has thefollowing advantages.

First, the non-linear working force applied equivalent to a requiredtorque in adjustment of the tilting angle of the stand with respect tothe base permits the user to adjust the tilting angle of the standsmoothly with a uniform force, easily.

Second, the easy, and smooth stand tilting angle adjustment throughoutan entire range of operation eliminates the problems of throwing thestand backward due to excessive force in a process the user adjusts thetilting angle, and the like.

Third, since the elastic member mounted between the first, and secondlink bars takes a portion of the torque in adjustment of the tiltingangle of the stand, an elastic force the torsion spring of the basehinge is required to take can be reduced, enabling to reduce a size ofthe torsion spring, with subsequent reduction of the base hinge, whichis favorable for producing a slim monitor.

Though a flat monitor has been described in the foregoing embodiment,the present invention is not limited to this. The present invention isapplicable to a Brown tube type monitor in similar or identical fashion.However, in this case, it is preferable that various parts of the standassembly are reinforced properly taking weight of the monitor intoaccount.

It will be apparent to those skilled in the art that variousmodifications and variations can be made in the present inventionwithout departing from the spirit or scope of the invention. Thus, it isintended that the present invention cover the modifications andvariations of this invention provided they come within the scope of theappended claims and their equivalents.

1. A stand assembly for a monitor, comprising: a stand including a firstend and a second end, the first end having a first torsion spring and afirst hinge that is rotatably coupled to a base, and the second endhaving a second torsion spring and a second hinge that is rotatablycoupled to a bracket configured to be fixed to a rear side of a monitorbody; a rotation member rotatably connected to the stand; a fixed memberfixed to the base; a first link and a second link, each having a firstend that is coupled to the fixed member and a second end that is coupledto the rotation member; and an elastic member having a first endconnected to a holding piece provided on one of the first or second endof the first link and a second end connected to a holding piece providedon the other of the first or second end of the second link, wherein thefirst ends of the first and second links each move within a respectiveslot formed in the fixed member and the second ends of the first andsecond links each move within a respective slot formed in the rotationmember so as to adjust a position of the first and second links relativeto one another as the first and second links rotate.
 2. The standassembly as claimed in claim 1, wherein the first link is positionedparallel to the second link.
 3. The stand assembly as claimed in claim2, wherein a length of the first link is the same as a length of thesecond link.
 4. The stand assembly as claimed in claim 1, wherein thefirst hinge includes a hinge shaft and a shaft holder configured to berotatably coupled with the hinge shaft.
 5. The stand assembly as claimedin claim 4, wherein the shaft holder of the first hinge is provided inthe stand.
 6. The stand assembly as claimed in claim 5, wherein thehinge shaft of the first hinge is provided in the fixed member.
 7. Thestand assembly as claimed in claim 4, wherein the base is configured torotate with respect to a supporting part.
 8. The stand assembly asclaimed in claim 1, wherein the second hinge includes a binge shaft anda shaft holder configured to be rotatably coupled with the hinge shaft.9. The stand assembly as claimed in claim 8, wherein the shaft holder ofthe second binge of the stand is provided in the stand.
 10. The standassembly as claimed in claim 9, wherein the rotation member isconfigured to be secured to the binge shaft of the second binge so as toprovide for simultaneous rotation of the binge shaft in accordance witha rotation of the rotation member.
 11. The stand assembly as claimed inclaim 1, wherein the bracket includes a pivot connection coupled to thesecond end of the stand, wherein the pivot connection is configured topivot a monitor coupled thereto.
 12. The stand assembly as claimed inclaim 1, wherein the elastic member is a coil spring.
 13. The standassembly as claimed in claim 1, wherein the first hinge includes atleast one friction member.
 14. The stand assembly as claimed in claim13, wherein the friction member is a disk-like member.
 15. The standassembly as claimed in claim 1, wherein the holding pieces are providednear an end portion of the first and second links near a portion of thefirst and second links that passes into its respective slot in the fixedmember and the rotation member such that the elastic member extendsbetween the holding pieces of the first and second links along alongitudinal length of the first and second links, and does not extendinto the slots formed in the fixed member and the rotation member. 16.The stand assembly as claimed in claim 1, wherein the first and secondends of the stand are configured to rotate about the first and secondhinges independently.
 17. The stand assembly as claimed in claim 1,wherein the first link is positioned above the second link, and whereina longitudinal position of the second end of the first link with respectto the second end of the second link changes as the first and secondlinks rotate relative to the base.
 18. The stand assembly as claimed inclaim 17, wherein the elastic member exerts an elastic force on thefirst link and the second link in proportion to the change inlongitudinal position of the second end of the first link relative tothe second end of the second link.